JPS62153743A - Probe rotating type ultrasonic flaw detection apparatus - Google Patents

Abstract

PURPOSE:To make it possible not only to simultaneously perform flaw detection and dimensional measurement but also to automatically perform the positional alignment of a material to be inspected and a probe holder, by providing a guide holes to the central parts of partition walls to which a water chamber for flaw detection and a water chamber for dimensional measurement are respectively formed. CONSTITUTION:A probe holder 14 is rotated at a high speed and water is injected in a water chamber 38 for flaw detection and a water chamber 36 for dimensional measurement from the proper place of a groove 90 through a water guide part 92. A material P to be inspected is inserted through the guide member 86 in a rotor 84 from the leading end thereof by a feed device and further successively inserted through the bushings 46, 48, 50 provided to the partition walls 28, 30, 32 of the probe holder 14. Then, ultrasonic waves are vertically emitted to the material P to be inspected from dimension measuring probes 52, 54 to measure the dimension and thickness of the material P to be inspected. The flaw detection of said material P to be inspected is performed by a method wherein ultrasonic waves are obliquely emitted to the material P to be inspected from flaw detection probes 62, 64, 66, 68 and ultrasonic echoes reflected and returned from the interface of the damage or flaw present in the material P to be inspected are detected.

Description

[Detailed description of the invention] [Industrial application field] In the present invention, a probe is held by a probe holder.

The material to be inspected is inserted into the center of the probe holder and transported.

The present invention relates to a probe rotating type ultrasonic flaw detection device that performs flaw detection by rotating a probe holder around the test material at high speed.

[Prior Art] In general, among metal pipes, those that require high quality and quality, such as extremely small diameter pipes used in nuclear power plants, are prone to scratches and defects in the material. Scattered ultrasonic flaw detection is performed not only for the measurement of dimensions such as inner and outer diameters and wall thicknesses (hereinafter referred to as measurement).

Conventional 1. In TflU wave deep flaw detection, a plurality of probes are held in a probe holder, a water chamber is formed,
By rotating the holter, the probe is rotated around the test material, and at the same time, by transporting the test material in the length direction, a spiral scanning trajectory is created on the outer circumferential surface of the test material. There was one that carried out high-density flaw detection by drawing.

On the other hand, as an ultrasonic call-side device, conventionally, a call-side probe is placed in a water tank whose side wall has an insertion hole with a suitable seal, and the test material is rotated.

There was one that carried out the calling side by inserting it through the above-mentioned insertion hole and transporting it inside the water tank.

[Problems to be Solved by the Invention] However, these conventional devices are mutually independent devices, and require separate functions for flaw detection and calling. Therefore,
It is necessary to set up the work for each one, which increases the amount of work, becomes complicated, and has the disadvantage that the time required for inspection also increases.

In addition, since the conventional single-measurement device uses a water tank, it is necessary to rotate the material to be tested.
It has the drawback that the rotation speed cannot be increased and inspection takes time.

Furthermore, with each of the conventional devices described above, it was not easy to align the center of the material to be inspected and the center of rotation. It is possible to perform both side and side at the same time, requiring only one setup, reducing the amount of work, making the work easier, and not only does it take less time to inspect, but also allows the inspection to be carried out more easily than the test material and the probe. It is an object of the present invention to provide a probe rotation type ultrasonic flaw detection device that can automatically perform alignment with the rotation center of a holder.

[Means for Solving the Problems] The present invention holds a probe in a probe holder, inserts and conveys a test material into the center of the probe holder, and moves around the test material. In a rotating probe type ultrasonic flaw detection device that performs flaw detection by rotating the probe holder at high speed, as a means to solve the above problem, partition walls are installed at both ends and the center of the probe holder. A water chamber for flaw detection and a water chamber for one measurement are provided, and a flaw detection probe is disposed in the former, while a call side probe is disposed in the latter, and the center of each of the above-mentioned bulkheads is The test piece is characterized in that the test piece is provided with a guide hole for guiding the test material so that the center of the test material substantially coincides with the center of rotation.

[Function] As shown in the above problem solving means, the present invention forms a flaw detection water chamber and one measurement water chamber in the probe holder, and the flaw detection probe is placed in the former, while the latter is provided with a flaw detection water chamber. Since a probe for the call side is installed in the tester, it is possible to conduct the call side at the same time as flaw detection. In this case, both water chambers are separated by a partition wall,
You can set the appropriate water distance for each. Furthermore, the water chamber for one measurement can be set small.

Further, in the present invention, a guide hole is provided in the center of each of the partition walls to guide the test material so that the center of the test material and the center of rotation are substantially aligned, so that the test material and the probe The test material is positioned by the guide hole without alignment with the rotation center of the child holder. Therefore, even in extremely small diameter pipes, flaw detection and call side can be performed accurately.

[Example] Embodiments of the present invention will be described with reference to the drawings.

<Configuration of Example> Figure 1 is a perspective view showing the external appearance of a rotating probe type ultrasonic flaw detection device to which this example is applied, and Figure 2 shows a probe holder, which is the main part of this example. The sectional view shown in FIG. 3 is an explanatory diagram showing the arrangement of each probe of this embodiment.

First, the probe rotation type ultrasonic flaw detection apparatus shown in FIG. 1 will be explained.

In the figure, each part of the device of this embodiment is arranged on the upper surface of a pedestal 10 in a straight line, and a device main body 12 that performs rotational drive and electrical connection of signals is installed in the center. The probe holder part 13 is connected to one end, and the transport devices 16 and 18 for transporting the test material P are arranged at both ends in the longitudinal direction of the pedestal lO so that their central axes coincide so that they can be transported precisely. It is.

As shown in FIG. 2, the probe holder 14 inside the probe holder section 13 consists of a mounting section 20.1, a measuring section 22, a flaw detecting section 24, and a medium introduction section 26, and as a whole has a plurality of cylinders with different diameters. The structure is designed to encourage conversion. Partition walls 28, 30 and 32 are provided at the boundary between each cylinder. The part shown in the same figure is a part that rotates at high speed, and on the outside thereof, there is an outer cover 34 that does not rotate (see Fig. 1).
A non-rotating part of '$ is provided.

A water chamber 38 for one measurement and a water chamber 38 for flaw detection are provided by the partition walls 28, 30 and 32. Also, the partition wall 28.
Through holes 40, 42 and 44 are provided concentrically in the center of each of 30 and 32, respectively. These through holes 40, 42 and 44 each have positioning bushings 46 that are precisely machined so that their centers coincide with the center of the probe holder 14 and their inner diameters are approximately equal to the outer diameter of the test material P. .4
8 and 50 are fitted. This bushing 46.4
The holes provided at 8 and 50 serve as guide holes for guiding the test material P so that its axis is aligned with the rotation center of the probe holter 14.

The call side part 22 includes 1 measurement probes 52 and 54, a temperature compensation probe 56 (see FIG. 3), and a reflection plate 58.
It is arranged with its end facing the water chamber 36 for one measurement. The probes 52, 54, 58 are held and mounted by suitable holding members. For example, when the water distance is adjusted, the probes 52 and 54 are held and fixed at that position by a holding member 60 as shown in FIG.

In the flaw detection section 24, flaw detection probes 62, 84, 88, and 68 are arranged with each end facing the flaw detection water chamber 38. Note that the flaw detection probe 68 is located at f of the cut surface and should not originally appear in the cross-sectional view of FIG. 2, but is shown in the same figure to show its position.

These flaw detection probes 82, 84, 66 and 68 are
In order to make the ultrasonic waves obliquely enter the test material P, it is set obliquely with respect to the center of rotation. This probe can also adjust the water distance and angle by using a suitable holding member. It is held so that the angle can be adjusted.

The attachment portion 20 is formed in a flange shape on the outside of the partition wall 2, and is fixed to an attachment portion 74 formed in a flange shape on the main body 12 side with a plurality of bolts 78. A connector plug 78 for connecting a signal line leading to the probe 52 and the like is provided on the mounting portion 2o in correspondence with the probe.

On the other hand, on the main body 12 side, a receptacle 80 is provided in the mounting portion 74 corresponding to the plug 78 described above. A signal line 82 connected from this receptacle 80 is connected to a signal transmitting/receiving section (not shown) such as a capacitor coupling that makes electrical connection between the stationary side and the rotating side. Further, the mounting portion 74 is connected to the rotor 84 at its center.

This rotor 84 is rotationally driven by an electric motor and a power transmission stage f (both not shown) housed in the pedestal 10, and rotates the probe holder 14 at high speed via the mounting portion 74. Furthermore, a guide member 86 for positioning the test material P at the center of rotation is inserted through the center of the rotor 84.

The medium introduction part 2G provided at the end of the probe holder 14 is fixed to the partition wall 32 by a port 88. A groove 30 is provided on the outer periphery of this medium introduction part 26, and a water guide part 92 that communicates with the flaw detection water chamber 38 from an appropriate position of this groove 90
is the provision. In addition, a flaw detection water chamber 38 and a first measurement water chamber 36 are also provided.
Water guide holes 93 are also provided in the partition wall 30 so as to communicate with each other. The groove 90 is sealed by a non-rotating case 94, and a medium (usually water) is injected under pressure from a medium inlet 96 provided in the case 94.

Note that in the above configuration, the first side water chamber 36 is connected to the probe holder 1.
Is this installed on the mounting part side of No. 4?

Since the probe holder 14 has a structure in which it is supported in a cantilevered manner by the mounting portion 20, the rotation is stabilized with the large-diameter portion to which a large centrifugal force is applied being on the base side.

Furthermore, in the above embodiment, ;f Jllll! 22 and the outer periphery of the flaw detection section 24, respectively, a cylindrical cover 98.1 is provided.
00 is installed. This is to prevent the water discharged from the probe holter 14 from scattering excessively and to protect the lead wire of the probe.

<Operation of the embodiment> The operation of the embodiment configured as described above will be explained with reference to the above-mentioned figures.

First, the rotor 84 is rotated by an electric motor (not shown) to rotate the probe holder 14 at high speed. Further, water as a medium is injected into the probe holder 14 from the medium inlet 96. This injection is performed by connecting a vibrator to the medium introduction port 96. The injected water flows from the appropriate position of the groove 90 to the water guide section 92.
It reaches the flaw detection water chamber 38 and the calling side water chamber 36 through
The water that fills these and overflows is discharged to the outside of the probe holder 14 from a drain (not shown).

On the other hand, the test material P is passed through the guide member 86 in the rotor 84 from the tip by the conveyance device 16, and is further inserted into the bushings 46, 48 and 50 provided on the partition walls 28, 30 and 32 of the probe holder 14. Sequential insertion, conveyance device 18
, and is transported at a constant speed in the direction of arrow A in FIG.

The call side and the flaw detection are started when the approach of the tip of the test material P is detected by a proximity sensor such as a limit switch (not shown).

On the call side, a sound wave is transmitted from the call side probes 52 and 54 to the test material P.
The outer diameter, inner diameter, wall thickness, etc. of the test material P are measured by emitting it perpendicularly to the object P and measuring the time it takes for the echo to return.

Note that this t-measurement is likely to cause errors due to changes in the speed of sound due to changes in the temperature of the medium. Therefore, in this embodiment, temperature compensation is performed.

This temperature compensation is performed by a temperature compensating probe 56 and a reflecting plate 58 facing the probe 56 at a constant distance. That is, detecting changes in the time required for the ultrasonic waves emitted from the temperature compensation probe 56 to be reflected by the reflection plate 58 and detected again by the temperature compensation probe 56 due to the speed of sound, This corrects the signal from the calling side probe and eliminates the influence of temperature changes.

Temperature compensation based on this concept has also been adopted in the case of calling side in a conventional water tank. However, this traditional temperature compensation is difficult due to the large size of the aquarium.

The temperature distribution of the water became uneven, making it impossible to make accurate corrections.

In this embodiment, the volume of the measuring water chamber for temperature compensation is small, and the water is stirred by high-speed rotation, so the temperature distribution becomes uniform and correction can be performed with high precision.

Flaw detection is performed by emitting ultrasonic waves obliquely to the test material P from the flaw detection probes 62, 64, 68 and 68.
1t reflected back at the interface of internal scratches and defects
This is done by detecting fl blind wave echoes. Since the probe holder 14 is rotating at high speed, this flaw detection is performed by four spiral scanning trajectories by the four probes 82, 84, 66, and 68.

In this way, in the unimplemented example, the calling side and the flaw detection are carried out simultaneously by transporting the material to be inspected only once, making it possible to significantly reduce the working time.

In addition, on the call side and during flaw detection, the material P to be tested is 3g 48.
Since it is restrained by 48 and 50, the call side and flaw detection are performed with its central axis substantially coinciding with the center of rotation of the probe holder 14. Therefore, it is possible to perform accurate call-side and flaw detection even on specimens with small diameters such as extremely small diameter pipes. In addition, in this embodiment, these bushings 4B
, 48 and 50 are tapered at their openings, so that when the tip of the test material is inserted, there is no collision with the tip, and the insertion can be made easily.

<Modification of the embodiment> In the above embodiment, a through hole is provided in the center of the partition wall of the probe holder, and a positioning bushing is fitted into this. and the bushing may be omitted.

Further, in this embodiment, four flaw detection probes are used, but of course the number is not limited to this.

[Effects of the Invention] As explained above, the present invention allows flaw detection and call side to be performed at the same time, requiring only one set-up for two operations, shortening the inspection time, and making it possible to This has the effect of automatically aligning the probe holster with the center of rotation.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the external appearance of a rotary probe type ultra) single-wave deep wound device to which this embodiment is applied, and Fig. 2 shows a probe holter, which is one of the main parts of this embodiment. Cross-sectional view, :p"S Figure 3 is an explanatory diagram showing the arrangement of each probe in the example. P... Test material 10... Frame 12...
Device body 14... Probe holder 16.18
...Conveyance device 20...Mounting section 22...S3
14 parts 24...Flaw detection part 26...Medium introduction part 28.30.32...Partition wall 34...
Outer cover 36...1 Water chamber for inspection 38...Water chamber for flaw detection 40.42.44...Through hole 46.
48.50...Bushing 52.54...J-measurement probe 7-56...Temperature compensation probe 58...Reflection plate 60...Holding part 62.64.66. 68...Flaw detection probe 70.
72... Holding member 74... Mounting part 76.88
... Bolt 78 ... Plug 80 ... Receptacle 82 ... Signal line 84 ... Rotor
86...Guide member 90...Groove 9
2...Water guide section 94...Case 96...Medium introduction [
198,100...Cover

Claims (2)

[Claims] (1) Hold the probe in a probe holder, insert and transport the test material into the center of the probe holder, and rotate the probe holder at high speed around the test material for flaw detection. In a rotating probe type ultrasonic flaw detection device, partition walls are provided at both ends and the center of the probe holder to form a water chamber for flaw detection and a water chamber for dimension measurement. A probe for flaw detection is placed on the other hand, and a probe for dimension measurement is placed on the latter, and the material to be tested is placed at the center of each of the partition walls, with the center of the material to be tested and the center of rotation approximately matching. 1. A rotating probe type ultrasonic flaw detection device comprising a guide hole for guiding the probe. (2) When providing the water chamber for flaw detection and the water chamber for dimension measurement of the probe holder, the former is placed on the distal end side of the probe holder, the latter on the base end side of the probe holder, and the A probe rotating type ultrasonic flaw detection apparatus according to claim 1, wherein the base end of the child holder is attached to a rotation drive section.